Stock Options - Exercise Price (Details) shares in Thousands	12 Months Ended
	Dec. 31, 2015 $ / shares shares
Options Outstanding
Outstanding at the end of the period (in shares) | shares	2,598
Weighted Average Remaining Contractual Life	3 years 9 months 4 days
Weighted Average Exercise Price (in dollars per share)	$ 0.63
Options Exercisable
Exercisable at the end of the period (in shares) | shares	2,287
Weighted Average Exercise Price (in dollars per share)	$ 0.51
$0.20-$0.50
Stock Options Outstanding and Exercisable
Exercise price, low end of range (in dollars per share)	0.20
Exercise price, high end of range (in dollars per share)	$ 0.50
Options Outstanding
Outstanding at the end of the period (in shares) | shares	1,481
Weighted Average Remaining Contractual Life	3 years 1 month 6 days
Weighted Average Exercise Price (in dollars per share)	$ 0.34
Options Exercisable
Exercisable at the end of the period (in shares) | shares	1,418
Weighted Average Exercise Price (in dollars per share)	$ 0.33
$0.51-$1.00
Stock Options Outstanding and Exercisable
Exercise price, low end of range (in dollars per share)	0.51
Exercise price, high end of range (in dollars per share)	$ 1.00
Options Outstanding
Outstanding at the end of the period (in shares) | shares	803
Weighted Average Remaining Contractual Life	3 years 8 months 19 days
Weighted Average Exercise Price (in dollars per share)	$ 0.68
Options Exercisable
Exercisable at the end of the period (in shares) | shares	778
Weighted Average Exercise Price (in dollars per share)	$ 0.69
$1.01-$3.00
Stock Options Outstanding and Exercisable
Exercise price, low end of range (in dollars per share)	1.01
Exercise price, high end of range (in dollars per share)	$ 2.87
Options Outstanding
Outstanding at the end of the period (in shares) | shares	314
Weighted Average Remaining Contractual Life	6 years 11 months 27 days
Weighted Average Exercise Price (in dollars per share)	$ 1.91
Options Exercisable
Exercisable at the end of the period (in shares) | shares	91
Weighted Average Exercise Price (in dollars per share)	$ 1.87